JP2002306606A - Puncture instrument for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a puncture instrument for an endoscope, capable of preventing the tip of a puncture needle from puncturing the inner surface of an overcoat tube in passing the curved passage even if a treatment instrument penetrating passage of the endoscope is curved near an outlet and smoothly projecting the puncture needle from the outlet of the treatment instrument penetrating passage. SOLUTION: The tip 2a of the puncture needle 2 disposed to freely move forward and backward in the axial direction in the tip of the flexible overcoat tube 1 is obliquely cut off to have an acute angle at the tip, and the outer surface of the most forward end part of the puncture needle 2 positioned on the back of the cut-off surface 2b is formed like a tapered surface 2c gradually narrowed toward the tip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puncture device for an endoscope which is used for performing a puncture treatment in a body through a treatment tool insertion passage of an endoscope.

[0002]

2. Description of the Related Art Generally, a puncture needle for an endoscope is a puncture needle made of a flexible stainless steel pipe whose tip is cut obliquely so as to form an acute angle on the front side. The puncture needle is disposed so as to be able to advance and retreat in the axial direction within the distal end of the mantle tube inserted into and removed from the tool insertion passage, and the puncture needle can be protruded and retracted from the distal end of the mantle tube by advancing and retracting operations from the base end side of the mantle tube. I can do it.

[0003]

When the puncture device for an endoscope as described above is passed through the treatment instrument insertion passage of the endoscope, the distal end of the puncture needle is slightly retracted from the distal end of the mantle tube. In this state, it is pushed into the treatment instrument insertion passage from the hand side.

Therefore, there is no problem when the treatment instrument insertion passage is formed straight near the exit as in a so-called forward-looking endoscope, but there is no problem with the treatment instrument insertion passage such as an ultrasonic endoscope. Is curving just before the exit,
As shown in FIG. 6, when passing through the curved portion of the treatment instrument insertion passage 52, the tip 2a of the puncture needle 2 may pierce the inner surface of the mantle tube 1, resulting in malfunction. Reference numeral 53 denotes a treatment tool outlet of the ultrasonic endoscope 50.

Therefore, according to the present invention, even if the treatment instrument insertion passage of the endoscope is curved near the exit, the tip of the puncture needle does not pierce the inner surface of the mantle tube when passing through the endoscope, and the puncture needle is treated. An object of the present invention is to provide a puncture device for an endoscope that can smoothly project from an outlet of a device insertion passage.

[0006]

In order to achieve the above object, a puncture device for an endoscope according to the present invention is characterized in that a puncture needle made of a flexible stainless steel pipe is inserted into a treatment tool insertion passage of the endoscope. The distal end of a flexible mantle tube inserted into and removed from the mantle tube is disposed so as to be able to advance and retreat in the axial direction so that the puncture needle can be advanced and retracted from the base end side of the mantle tube so as to protrude and retract from the distal end of the mantle tube. In the puncture device for an endoscope, the tip of the puncture needle is cut obliquely so that the tip side becomes an acute angle, and the outer surface of the tip of the puncture needle located on the back side of the cut-off surface has a narrowed front side. It is formed in a tapered shape.

[0007] The tapered portion only cuts the tube wall at the foremost portion of the puncture needle, but does not reach the inner peripheral surface of the tube wall. The shape becomes smooth.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows the entire configuration of the endoscope puncture device. A flexible mantle tube 1 that is inserted into and removed from a treatment tool insertion passage of an endoscope (not shown) has, for example, an outer diameter of about 2 mm. It is formed of a tetrafluoroethylene resin tube having a length of about 1 to 2 m.

A puncture needle 2 made of a thin, flexible stainless steel pipe is inserted through the entire length of the outer tube 1 so as to be able to advance and retreat in the axial direction.
An insertable / removable stylet 3 for preventing clogging is inserted through the entire length of the puncture needle 2. Stylet 3
Is formed of a highly flexible material such as a thin stainless steel wire.

A proximal end of the mantle tube 1 is connected and fixed to an operating section main body 11 of the operating section 10. A proximal end of the puncture needle 2 passing through the operating section main body 11 has a proximal end inside the puncture needle 2. An injection mouthpiece 12 for feeding a chemical solution or the like is attached. Reference numeral 13 denotes a stylet 3 knob,
It is arranged so that it can be freely disengaged from.

Reference numeral 14 denotes a stopper fixed to the puncture needle 2 in the operation unit 10. The rubber O-ring 15 attached to the operation unit main body 11 is elastically click-engaged with the stopper 14. , The state of FIG.
The state where the distal end 2a of the puncture needle 2 is stored in the distal end of the mantle tube 1) is maintained.

With this configuration, the tip 2a of the puncture needle 2 can be arbitrarily protruded and retracted from the tip of the mantle tube 1 by operating the injection mouthpiece 12 in the axial direction with respect to the operation unit body 11. .

An injection port 16 is formed on the operation section main body 11 so as to protrude to the side. be able to.

FIGS. 1 and 2 show a distal end portion of the mantle tube 1. FIG. 1 shows a state in which the distal end 2a of the puncture needle 2 is housed in the distal end of the mantle tube 1. FIG. This shows a state in which the distal end 2a of the puncture needle 2 protrudes from the distal end of the mantle tube 1, and the stylet 3 is pulled out rearward.

The tip of the puncture needle 2 is cut obliquely so that the tip 2a is at an acute angle.
The outer surface of the distal end portion of the puncture needle 2 located on the back side of b is formed in a tapered shape (tapered surface 2c) with a tapered tip, and the tip 2a where the cut-off surface 2b and the tapered surface 2c intersect is the needle tip. Has become.

The tapered surface 2c merely cuts off the tube wall at the tip of the puncture needle 2 and does not reach the inner peripheral surface of the tube wall. Therefore, the tip 2a of the puncture needle 2 has a smooth blade shape.

FIG. 4 shows a state in which the puncture device for an endoscope of the above embodiment is inserted into a treatment tool insertion passage 52 of an ultrasonic endoscope 50 in which an ultrasonic probe 51 is disposed at a distal end portion. The state immediately before protruding from the treatment tool outlet 53 of the endoscope 50 is shown.

The treatment instrument insertion passage 52 at this position is provided with a treatment instrument ejection port 5 so that an endoscopic puncture instrument or the like can be projected into the ultrasonic scanning range of the ultrasonic probe 51.
3 is smoothly bent at a small radius of curvature immediately before, along which the mantle tube 1 advances.

At this time, the distal end 2a of the puncture needle 2 which is the tip of the puncture needle 2 is smoothly bent because the tapered surface 2c is formed at the foremost portion located on the back side of the cutting surface 2b of the puncture needle 2. Since it is floating from the inner surface of the mantle tube 1, it does not pierce the inner surface of the mantle tube 1.

Then, by performing an operation of pushing the puncture needle 2 in the operation unit 10, as shown in FIG.
The distal end 2a of the puncture needle 2 protrudes from the distal end of the mantle tube 1 to perform a puncture treatment on a target diseased part or the like.

[0021]

According to the present invention, the tip of the puncture needle is cut obliquely so that the tip side is at an acute angle, and the outer surface of the tip end portion of the puncture needle located on the back side of the cut-off surface is cut forward. Even when the treatment instrument insertion passage of the endoscope is curved near the exit by forming it into a tapered tapered shape, the tip of the puncture needle does not pierce the inner surface of the mantle tube when passing through it, and puncture The needle can be smoothly projected from the outlet of the treatment instrument insertion passage.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view of a distal end portion of a puncture device for an endoscope according to an embodiment of the present invention in a state where a puncture needle is retracted.

FIG. 2 is a side sectional view of a distal end portion of the puncture device for an endoscope according to the embodiment of the present invention in a state where a puncture needle is protruded.

FIG. 3 is a side cross-sectional view showing the entire configuration of the endoscope puncture device according to the embodiment of the present invention.

FIG. 4 is a side cross-sectional view showing a state immediately before a distal end portion of the puncture device for an endoscope according to the embodiment of the present invention projects from a treatment tool outlet of an ultrasonic endoscope.

FIG. 5 is a side sectional view showing a state in which a distal end portion of the puncture device for an endoscope according to the embodiment of the present invention projects from a treatment tool outlet of an ultrasonic endoscope.

FIG. 6 is a side cross-sectional view showing a state immediately before a distal end portion of a conventional endoscope puncture tool projects from a treatment tool outlet of an ultrasonic endoscope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer tube 2 Puncture needle 2a Tip 2b Cutting surface 2c Tapered surface 3 Stylet 10 Operating part 52 Treatment tool insertion passage 53 Treatment tool protrusion

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4C061 GG15 4C066 AA01 AA09 BB01 CC01 FF03 KK03 4C167 AA23 AA77 BB02 BB26 CC06 CC29 GG04 GG22

Claims (2)

[Claims] 1. A puncture needle made of a stainless steel pipe having flexibility is disposed in a distal end of a flexible mantle tube inserted into and removed from a treatment instrument insertion passage of an endoscope so as to be able to advance and retreat in the axial direction. ,
An endoscope puncture device that can be advanced and retracted from the proximal end side of the mantle tube so that the puncture needle can be protruded and retracted from the distal end of the mantle tube, wherein the distal end of the puncture needle has an acute angle at the front end. A puncture device for an endoscope, wherein the outer surface of the distal end portion of the puncture needle located on the back side of the cut surface is formed in a tapered shape with a tapered tip. 2. The endoscope according to claim 1, wherein the tapered portion only cuts a tube wall at a tip end portion of the puncture needle and does not reach an inner peripheral surface of the tube wall. Puncture tool for mirror.